Asterisk triangle in python

ascii-art, python

Solution

I already answered the same question earlier. Keep in mind that none of the functions you mentioned are `recursive` functions. You can read more about recursion here.

This is the example I mentioned here.

Python 3.X

def asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print(' ' * ( i + 1 ) + '*' * ( t * 2 + 1 ))
        return asterix_triangle( i - 1, t + 1 )

asterix_triangle(5)

And here you have an upside down version of an recursive function.

def upside_down_asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print(' ' * ( t + 1 ) + '*' * ( i * 2 - 1 ))
        return upside_down_asterix_triangle( i - 1, t + 1 )

upside_down_asterix_triangle(5)

Python 2.X

def asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print ' ' * ( i + 1 ) + '*' * ( t * 2 + 1 )
        return asterix_triangle( i - 1, t + 1 )

asterix_triangle(5)

And here you have an upside down version of an recursive function.

def upside_down_asterix_triangle(i, t=0):
    if i == 0:
        return 0
    else:
        print ' ' * ( t + 1 ) + '*' * ( i * 2 - 1 )
        return upside_down_asterix_triangle( i - 1, t + 1 )

upside_down_asterix_triangle(5)

Edit: Screenshot showing the script running in my IDE.

Edit2: Added code that works under Python 3.x

Edit3: Added iterative function for Python 3.X

def create_pyramid(rows):
    for i in range(rows):
        print((' ' * ( rows- i - 1 ) + '*' * ( 2 * i + 1)))

print((create_pyramid(5)))

def create_upside_down_pyramid(rows):
    for i in reversed(list(range(rows))):
        print((' ' * ( rows- i - 1 ) + '*' * ( 2 * i + 1)))

print((create_upside_down_pyramid(5)))

Problem

I have to write a recursive function asterisk_triangle which takes an integer and then returns an asterisk triangle consisting of that many lines. For e.g this is a 4 line asterisk triangle. ``` * ** *** **** ``` I came up with this function: ``` def asterisk_triangle(n): """ takes an integer n and then returns an asterisk triangle consisting of (n) many lines """ x = 1 while (x <= n): print("*" * x) x = x + 1 return ``` And also I had to create an upside down asterisk triangle by manipulating the first function. I came up with this function and result: ``` def upside_down_asterisk_triangle(n): """ takes an integer n and then returns a backwards asterisk triangle consisting of (n) many lines """ x = 0 while (x < n): print("*" * (n-x)) x = x + 1 return **** *** ** * ``` Now I have to manipulate these functions to create a backwards asterisk triangle. ``` * ** *** **** ``` And a backward upside down asterisk triangle. ``` **** *** ** * ``` What functions should I implement? I have tried using the reverse string command [::-1] after the function and it didn't work.

Original source